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Transformati  20h in secunde    4h 7min 30 s in  secunde   40min in secunde    8h 25min in secunde   60s in h     3min 20sec in h 

Răspuns :

20h=20h*60min=1200minute
1200minute*60secunde=72000secunde
4h7min30s=4*60+7*60+30=240minute+420s+30s=240*60+450=25200+450=25650secunde
 40min=40*60=2400secunde

8h=8*60*60=28800secunde
25min=25*60=1500secunde
28800+1500=30300secunde 

3min20sec=3*60+20=180+20=200secunde
Bafta sper sa fie bine.

20h=72000 s
4h 7min 30 s=14,850 s
40min=2400 s
 8h 25min =30,300 s
60s =0.016667 h
3min 20sec=0.055556 h